Brake.



W. S. HUTCHINSON.

BRAKE.

APPLICATION FILED Aue.4, 1915.

1,192,316, r Patented July25, 1916.

1? whom mg k EML QQK WILLIAM S. HUTCHINSON, OF OYSTER BAY, NEW YORK.

BRAKE.

Specification of Letters Patent.

Application filed August 4, 1915. Serial No. 43,692.

To all whom it may concern:

Be it known that I, WILLIAM S. Huron- INSON, a citizen of the United States, and a resident of Oyster Bay, Nassau county, and State of New York, have invented a new and useful Improvement in Brakes, of which the following is a full, clear, and exact description.

My invention relates to improvements in brakes and especially -to so-called drum brakes in which friction is applied to the inner surface of a rim, usually the rim on a drum which iscarried by the hub of an automobile wheel, but obviously thebrake mechanism can be applied to any rotating rim which it is desired to control by a brake.

The object of my invention is to produce a very strong and simple means for locking a rotatable rim or member.

Another object of my invention is to apply the brake mechanism in such a manner that when the rim rotates in either direction and the inner shoe is in contact with the rim, the shoe will be automatically and forcibly impinged against the rim.

Another object of my invention-is to con struct the mechanism so that the shoe will always be in the right position for imme diate and positive action and held 1n such a way that the shoe can be immediately locked or released.

Reference is to be had to the accompany-' 2 is a cross section of the structure shown in Fig. 1, and Fig. 3 is a detail of a slightly modified form of the invention.

In the drawings 10 represents a rim to which it is desired to have the brake applied, and this can be any rotatable member, though as illustrated and as usual, it is affixed to the drum 11, the latter being rigid on the wheel hub 12 which is carried as usual by the axle 13. The shoe 14 is arranged within the rim 11 and movable back and forth in relation thereto, the shoe being preferably substantially concentric with the rim and having its ends adjacent and connected by a spring 15. Mechanism 16 is used for opening and closing the shoe, that is for bringing it into frictional engagement the shoe in any convenient manner.

- with the rim 11, and removing it from such frictional engagement. When the rim 11 is rotating and the shoe is in frictional engagement therewith, the parts are automatically looked, as will presently described.

At necessary intervals on the inner part of the shoe 14. are lever blocks 17 which are pivoted as shown at 18 to the members 19 whlchclamp the strengthening rib 14 of the shoe, but these members 17 can be pivoted to Each lever block 17 is preferably of a generally Patented July 25,1916. I

triangular shape, though the shape is not essential, and on its inner face it has a plurality of seats 20 opening inwardly and adapted to seat upon the studs 21 which are spacedapart and have a stationary position with reference to the rotating rim 11. These studs can be supported in any convenient way, and as shown are carried by the end plate 22 which covers the open end of the drum 11, and'is secured to the housing 23 on the axle 13. 7

It will beseen that when the shoe 14 is in frictional engagement with the rim 11 and the latter is moved in either direction,

. the blocks 17 acting as levers, will oscillate,

and one of the studs 21 of each block will serve as a fulcrum so that the shoei is forced strongly? against the rim 11. If-ifthe rim moves in the Oopposite direction, the same "action takes place except that each block oscillates on the second serves as a fulcrum.

It will be noticed that the pins 21 and blocks 17 serve to positionthe shoe 14 with pin, which in this case relation to the rim, and further that the essential thing is to have the studs or abutments 21 stationary, while the members 17 are pivotally connected with the shoe. It is not essential that they be connected in the exact manner shown, but they should have a pivotal connection so as toadaptthen'bselves to the movement of the shoe and to rock on their respective fulcrums 21 when in either I. and that the block 1"! will rock first, on one ball 17*" and then on the other, while the socket serves to keep the block in proper relation to other parts of the structure.

I cla1m: 1. A brake comprising a rotatable member, a shoe arranged within said member and movable back and forth in relation thereto, a lever block pivotally connected withthe back of the shoe, and stationary abutments between the lever block and the axis of the rotatable member, said lever block seating and rocking upon said abutmerits.-

2.'A brake comprising a rotatable memher a shoe essentially concentric with and lying within said rotatable member, the shoe having) a limited rotary movement with said rotata 1e member, a plurality of oscillating blocks pivotally connected with the shoe,

and a plurality of abutments for each block upon which the block seats and rocks, said -abutments being located between the shoe and the aims of the rotatable member.

3. A brake comprising a rotatable member, a 'shoe arranged withinthe member and movable into and out of frictional engage. ment with said member, said shoe also having a limited rotary movement in both directions with said rotatable member, a plural-' ity of blocks pivoted to the back of the shoe,

and each provided with seats spaced apart, and abutments' for said block seats,; said abutments being located between the shoe and the axis of the rotatable member;

- (1. A brake comprising a rotatable mem her, an 'expansible shoe arranged within the member and essentially concentric therewith, said' shoe having a limited rotarymovement with said rotatable member, va plurality of blocks pivoted to the back of the shoe, and stationary 'abutments for each block, said abutments being spaced apart and serving as fulcrums for'the oscillating 

